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Issue A&A
Volume 447, Number 2, February IV 2006
Page(s) 413 - 418
Section Cosmology (including clusters of galaxies)
DOI http://dx.doi.org/10.1051/0004-6361:20053668



A&A 447, 413-418 (2006)
DOI: 10.1051/0004-6361:20053668

From Hubble diagrams to scale factors

T. Schücker1 and A. Tilquin2

1  Centre de Physique Théorique, CNRS - Luminy, Case 907, 13288 Marseille Cedex 9, France
    e-mail: schucker@cpt.univ-mrs.fr
2  Centre de Physique des Particules de Marseille, CNRS - Luminy, Case 907, 13288 Marseille Cedex 9, France
    e-mail: tilquin@cppm.in2p3.fr

(Received 21 June 2005 / Accepted 23 September 2005 )

Abstract
Aims.We study the image of the transform from scale parameters to Hubble diagrams and present a lower bound on the radius of the universe today a0 and a monotonicity constraint on the Hubble diagram.
Methods.Our theoretical input is minimal: Einstein's kinematics and maximally symmetric universes.
Results.Present supernova data yield $a_0 > 1.2\times 10^{26}$, i.e. $\Omega_{k0} > -1.29$. We attempt to quantify the monotonicity constraint and do not see any indication of non-monotonicity.


Key words: cosmological parameters




© ESO 2006


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